﻿using System; 
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq.Expressions; 
using System.Linq;
using System.Reflection; 
using System.Text; 
using System.Data.Linq;
 
namespace System.Data.Linq.SqlClient {

    // SQL Client extensions to ExpressionType
    internal enum InternalExpressionType { 
        Known = 2000,
        LinkedTable = 2001 
    } 

    abstract internal class InternalExpression : Expression { 
#pragma warning disable 618 // Disable the 'obsolete' warning.
        internal InternalExpression(InternalExpressionType nt, Type type)
            : base ((ExpressionType)nt, type) {
        } 
#pragma warning restore 618
        internal static KnownExpression Known(SqlExpression expr) { 
            return new KnownExpression(expr, expr.ClrType); 
        }
        internal static KnownExpression Known(SqlNode node, Type type) { 
            return new KnownExpression(node, type);
        }
    }
 
    internal sealed class KnownExpression : InternalExpression {
        SqlNode node; 
        internal KnownExpression(SqlNode node, Type type) 
            : base(InternalExpressionType.Known, type) {
            this.node = node; 
        }
        internal SqlNode Node {
            get { return this.node; }
        } 
    }
 
    internal sealed class LinkedTableExpression : InternalExpression { 
        private SqlLink link;
        private ITable table; 
        internal LinkedTableExpression(SqlLink link, ITable table, Type type)
            : base(InternalExpressionType.LinkedTable, type) {
            this.link = link;
            this.table = table; 
        }
        internal SqlLink Link { 
            get {return this.link;} 
        }
        internal ITable Table { 
            get {return this.table;}
        }
    }
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.